;;; - SB-THREAD::SPINLOCK (type), since 1.0.53.11 (08/2011) -> Late: 08/2012
;;; - SB-THREAD::MAKE-SPINLOCK, since 1.0.53.11 (08/2011) -> Late: 08/2012
;;; - SB-THREAD::WITH-SPINLOCK, since 1.0.53.11 (08/2011) -> Late: 08/2012
;;; - SB-THREAD::SPINLOCK (type), since 1.0.53.11 (08/2011) -> Late: 08/2012
;;; - SB-THREAD::MAKE-SPINLOCK, since 1.0.53.11 (08/2011) -> Late: 08/2012
;;; - SB-THREAD::WITH-SPINLOCK, since 1.0.53.11 (08/2011) -> Late: 08/2012